Critical Microscopy; How To Get The Most Out Of The Microscope

Paperback | February 5, 2012

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922. Excerpt: ... THE MANIPULATION OF THE MICROSCOPE AND ITS ACCESSORIES. Critical Microscopy. As that great microscopist Mr. Eliot-Merlin has stated: " There is only one kind of true critical microscopy, i.e., that so named, originated and demonstrated by Edward Milles Nelson for many years past." Critical microscopy is the beginning and the end of microscopy, and is the only method whereby one can get the highest possible efficiency out of the microscope; it is the attainment of the concert pitch of the instrument. Nelson has defined it as follows:--"Critical Image.--The image of an object is critical when it is obtained by means of an objective of fine quality which has been placed in correct adjustment for that object by its screw collar, or by the alteration of the tube-length, and when the illumination is critical. "Critical Illumination.--An object is said to be illuminated critically when it is placed at the apex of a solid axial cone, the aperture of which is not less than three-quarters of the N.A. of the observing objective." How to obtain Critical Illumination. It is assumed that the microscope is fixed to a board with the lamp in front of it, as has been described previously, and that the edge of the flame is directed towards the microscope. Incline the microscope to a comfortable angle. It is to my mind of extreme importance that the microscope should te placed in such a position that the head of the observer is in as natural and comfortable an attitude as possible. To work for any long period with the tube of the microscope vertical, whatever be the position of the observer, is extremely tiring. No wonder that so many workers get aching of the eyes or a headache when, as one so commonly sees in laboratories, they sit on a high-legged stool and lean over a ve...

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Title:Critical Microscopy; How To Get The Most Out Of The MicroscopeFormat:PaperbackDimensions:36 pages, 9.69 × 7.44 × 0.07 inPublished:February 5, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:021781512X

ISBN - 13:9780217815123

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